1. With the engine stopped, depress the brake pedal several times to release pressure from the accumulator. Remove the master cylinder together with the valve bracket and the control unit from the vacuum brake booster, being careful not to over-deform the brake lines.
2. Disconnect from the hydrobooster of brakes of a tube. Plug all openings to prevent dirt from entering.
3. Working in the cab, disconnect the pusher of the hydraulic brake booster from the lever, then unscrew the nuts securing the hydraulic booster to the bulkhead of the engine compartment (see photo).
4. Installation is carried out in the reverse order. When finished, bleed the air from the hydraulic steering (see Chapter 10).